Osmosis through a semipermeable membrane: effects of
solution concentration on the weight of deshelled eggs
Solutions are liquid monophase homogenous mixtures comprised of a solvent - usually, though not always, the prevalent substance and solute, the less prevalent substance. A dissolved substance will be distributed uniformly throughout the solution, at molecular level. The quantity of solute per unit of solution volume or mass is called concentration. This quantity can be expressed as mass per mass of solution (percentage, g of solute per 100 g of solution) or amount per volume (molarity, mol/dm3).
A semipermeable membrane (or selectively permeable membrane) is a membrane that allows the passage of certain substances between the compartments it divides, while preventing passage of others. If two compartments containing solutions of different concentrations are divided by a semipermeable membrane, the entire system will attempt to reach balance. The solution with the higher concentration of the solute is said to be hypertonic to the other solution, while the solution with the lower concentration is said to be hypotonic. Since the system will attempt to balance out the osmotic pressure at both sides of the membrane, the membrane will allow the passage of the substance it is selective for. This process is known as osmosis and it continues until a balance is reached and both sides of the membrane contain solutions of equal osmotic pressure.
Cell membranes are semipermeable membranes. They are a complicated model, because they allow the cell to maintain constant content of certain solutes, using both passive and active transportation to ensure the precise composition of the cytoplasm. There are many synthetic membranes that a...
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... be impossible in the hypotonic solution because the membrane would eventually break), i.e. until the eggs stop losing water and their mass becomes constant.
Conclusion
The experiment shows, qualitatively, that two solutions of different osmotic pressures, separated by a semipermeable membrane, will tend to balance out their tonicity. In this particular instance, an egg placed in a hypertonic solution will lose weight as it loses water, and placed in a hypotonic solution, will gain weight as water passes in.
However, no quantitative assessments are possible from the data obtained in this experiment and further experimentation is needed to address these shortcomings.
References cited
Stegall-Faulk, T. Kulkowski, M., Stewart, W. & Cobb, V. (2014) Biology 2011/2021 Human Anatomy and Physiology Laboratory Manual. Plymouth, MI: Hayden-McNeal Publishing.
This process can also be defined as osmosis, which is the diffusion of water molecules across a membrane. (Unknown, 2) When we first got the egg it would be an isotonic solution meaning that it had equal tension (Unknown,1) which would mean that the same amount was inside the cell as outside of it. The purpose of the experiment was to learn about diffusion, concentration gradient, passive transport, equilibrium, osmosis, tonicity, hypertonic solutions, hypotonic solutions, isotonic solutions, and osmoregulation. If I put the egg in corn syrup, then the egg will deform because it has been placed in a hypertonic solution.
During this experiment Brine Shrimp were placed in four bowls. These four bowls contained 2 cups of either water, vinegar or a water and vinegar solution with 50 shrimp in each. Over a course of 3 hours all of the shrimp in the vinegar mixtures died. Beginning this experiment, the control group, placed in two cups of water moved around the bowl actively. This differentiated from the groups placed in vinegar solutions. These shrimp were placed in one of three bowls. In group 2 the tank consisted of one and a half cups water and a half cup vinegar. The third bowl contained one cup water and one cup vinegar. Lastly, the fourth bowl included two cups of vinegar. The shrimp in the control group were the most active. The shrimp in these bowls moved
In the diagram below on the right, we see two solutions divided by a partially/selectively permeable membrane (i.e. one that is porous, but allows water molecules through faster than dissolved substances). Text Box: Originally, the two solutions were; pure water, on the left, and sugar solution with a high sugar concentration, on the right. The pure water solution is said to have higher water potential than the concentrated sugar solution, because the water will flow from the area of high concentration of free water molecules (the dilute solution), to the area of low concentration of free water molecules (the concentrated solution). In other words, to the sugar solution.
This cell membrane plays an important part in Diffusion. Cell membrane and Diffusion Diffusion is the movement of the molecules of gas or liquids from a higher concentrated region to a lower concentration through the partially permeable cell membrane along a concentraion gradient. This explanation is in the diagram shown below: [IMAGE] Turgor When a plant cell is placed in a dilute solution or a less concentrated solution then the water particles pass through the partially permeable membrane and fill the cell up with water. The cell then becomes Turgor or hard. An example of this is a strong well-watered plant.
Solutions have three different stages that the solutes can be classified in: isotonic, hypertonic, and hypotonic. Isotonic is when the solutions have equal amounts of solutes. Like equilibrium, there is no net change in the amount of water in either solution. When the solutions have different concentration of solutes then the one with less solute is hypotonic and the one with more solute is hypertonic. Hypotonic takes in the solute from the hypertonic side that gives away the solute.
Marieb, E. N., (2006). Essentials of human anatomy and physiology. San Francisco, CA: Benjamin Cummings.
The purpose of this experiment is to investigate the effect of changing the concentration of sodium chloride solution on the rate of osmosis in tubes of potatoes. This was maintained using equal measurements of the potato tubes and applying them into the different concentrations of sodium chloride, 0%, 2%, 5%, 10%, 20% and 26%, in beakers then measuring the change in mass of the potato tubes afterwards. The time taken for all potato tubes to be placed in solution was 15 minutes. Can the concentration gradient of the sodium chloride solution influence on the rate of osmotic diffusion undergone by the potato tubes?
When a cell membrane is said to be selectively permeable, it means that the cell membrane controls what substances pass in and out through the membrane. This characteristic of cell membranes plays a great role in passive transport. Passive transport is the movement of substances across the cell membrane without any input of energy by the cell. The energy for passive transport comes entirely from kinetic energy that the molecules have. The simplest type of passive transport is diffusion, which is the movement of molecules from an area of high concentration to an area of lower concentration. Diffusion
Investigate the Osmosis of Potato Cells in Various Salt Solutions. Introduction I have been asked to investigate the effect of changing the concentration of a solution on the movement of water into and out of potato cells. I will be able to change the input of my experiment. The input variable is the concentration of the solution.
In life, it is critical to understand what substances can permeate the cell membrane. This is important because the substances that are able to permeate the cell membrane can be necessary for the cell to function. Likewise, it is important to have a semi-permeable membrane in the cell due to the fact that it can help guard against harmful items that want to enter the cell. In addition, it is critical to understand how water moves through the cell through osmosis because if solute concentration is unregulated, net osmosis can occur outside or inside the cell, causing issues such as plasmolysis and cytolysis. The plasma membrane of a cell can be modeled various ways, but dialysis tubing is especially helpful to model what substances will diffuse or be transported out of a cell membrane. The experiment seeks to expose what substances would be permeable to the cell membrane through the use of dialysis tubing, starch, glucose, salt, and various solute indicators. However, before analyzing which of the solutes (starch, glucose, and salt) is likely to pass through the membrane, it is critical to understand how the dialysis tubing compares to the cell membrane.
Diffusion is when substances diffuse from areas with many particles of the substance and areas with fewer particles of the substance. Concentration is the amount of substance in an area, which means diffusion is when substances diffus...
-The cells in the body will increase because osmosis causes molecules to move from a less concentrated solution to a more concentrated solution.
Seven evenly cut pieces of potato cylinder were incubating in distilled water, 0.1M, 0.2M, 0.3M, 0.4M, 0.5M, and 0.6M sucrose solutions for 1.3 hours to test the effect of osmolarity on the potato tuber cell. The pieces were weighed and compared to the weight of the potato before the incubation. Each final weight of the potato cylinder decreased as the concentrations of sucrose became higher, and the change in weight of the potato decreased in the higher concentrations of sucrose. Within the incubation period, the water
Potato cores are made of countless cells. A semi-permeable layer called the cell membrane surrounds each potato cell. The cell membrane acts as a barrier between the cytoplasm and its environment. It also gives the cell its structure. The reason why the cell membrane is semi-permeable is because it is mainly composed of a phospholipid bilayer that only allows non-polar and small molecules to pass through it. Fortunately, the cell membrane also contains many transport proteins that allow charged and larger molecules such as water to move into the cell. Other proteins in the cell membrane include glycoprotein and enzymes which are involved in cellular functions such as recognition of other cells and chemical messaging. Another component of the cell
soaking it in has a lower solution that the cell sap I will expect the